Undefeated former world supermiddleweight champion believes George Groves'
stamina may be an issue in his rematch with Carl Froch

Joe Calzaghe, the undefeated former world supermiddleweight champion, believes George Groves' stamina may be an issue in his rematch with Carl Froch.

Calzaghe, feted Monday at a lunch with the Boxing Writers' Club ahead of his induction into the International Boxing Hall of Fame in two weeks' time, commented: "Groves has to do what he did in the first fight, but he ran out of stamina to continue. He should be training for 15 rounds."

"He ran out of puff. It's whether he can keep it up for twelve rounds. Some people can. I was a 15-round fighter. Everybody is different. You can train as hard as you want, certain fighters can keep going, others can't. Some people haven't got 12 rounds in them at a fast pace.

"One thing about Froch, he keeps coming. You need to nail the guy down. So he will always be dangerous."

"It's whether Groves can keep that style for twelve rounds, because he is going to need to. Groves will have to improve and will have to have learnt from that first fight."